Unfortunately, I am in the US and the meds I use would likely not be available in the UK.

I can not imagine baby zebras surviving the whole process of being caught and smuggled out of Brazil. Something seems fishy about this to me. A baby zebra would be an inch or less. As a breeder of these fish, I have always followed a rule that says the absolute minimum size for shipping is 1.25 inches TL and larger is preferred. Also the minimum age would be 6 months and for me its more like 9 or more.